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Deja Vu #02
30 сентября 1997 |
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drop of solder - XTR-Modem & Soft: Vicomm.
Author: Alexei Mikhailov
__________________________________________
*
NEWS
Here, perhaps, the most interesting news
for network users - yield in the light of a new modem, which in
my opinion modem will be the future in SpbZxNet, and probably
throughout the rest of the country, especially in those regions
where the modem connection to the ZX only raises his head, or
do not began its existence.
As the Coordinator, as the sysop, as just
sinklerista, I can not remain indifferent to the fact that
thanks to the development network continues to evolve and
Spectrum, and XTR-modem - to the living proof. The developers
of hardware and as well as software, is always dependent on
consumers, and now they see that the network
growing, that good old Vikomm for various
reasons, no longer satisfied with men.
Many people can not make calls to daytime station because at
work, and in the evening, in the most convenient time,
sometimes it just does not break - some sysops are already
forced to terminate the registration of new users because of
the large number of points and users, which are sometimes put
on a PILE UP. Well, you want to sleep at night ... And
vikommki maximum speed - 2400 baud:
it is not so much, at least
I would like more.
And now it's time to say no primitive transformer, which costs
just a huge amount due to the fact that his
produced in only one person -
Sergey Usov, which to some extent a monopolist. Well would that
kind of money pay for a normal modem, but not for Vikomm after
all!
In a nutshell, that may a new modem.
First, pick up / drop tube without
'Feature', and secondly, to determine the number
caller to dial automatically
any number (multiple numbers) that
provides unique opportunities for
bbsnogo software for simple points: the evening included a
computer, went to bed, the modem itself to get through to
bbs'ki, leaked e-mail and files sent your e-mail, and you with
utretsa (or after work) calmly and without any hassle to sit
and read the mail - is not it-if, just great? Not a bad rate -
3200 promises even on bad lines, and the good - much higher
ease of connection - stuck in the system connector and
everything! New modem will cost no more than Vikomma. So I
think that sooner or later the entire network will still move
to the XTR-modem'y, in fact, it's only software ...
And now - the word of the authors.
(C) <LD> X-TRADE GROUP
XTR-modem
So it's time to gladden the world SPECCY - XTR done, debugged
and put into production. Announcement of ZF # 5 had to
information about the necessity of this product on the market.
This very information we are raped, so the number of
commercials for the 10-st April is expected to first Party
modems.
Satisfying the public interest, I'll tell
briefly about the concept of a modem.
----- ---- IRON
Initially we planned to improve VICOMM and make it as cheap.
Alas, no half-measures have failed, initial handicap VICOMMa
not allowed to implement all ideas, namely: the ability to
automatically (no buttons)-hook, call control and Employment
line. All this provides unprecedented opportunities, such as:
pulse and tone dialing, the ability to dial, caller ID, dialed
the phone with a parallel, automatic detection Caller ID (CLI),
as well as a modem better service and improving the quality of
reception / transmission.
I do not do nothing to stop the incidental function of a
modem - caller ID, because AON think certainly useful and
necessary function in the modem.
Therefore software compatibility with VICOMMom was lost, but
not completely.
When communicating on the network process is as follows: you
turn on the machine, load a program, turn off the monitor,
Switch the phone off to avoid ringing and go to bed. And in the
morning over a cup of tea and a plate of semolina, you are
flipping through ascended message.
Has an internal modem (it's cheaper
structure) - it is stuck in the slot SCORPION / KAY and his
connection is not accompanied by heating of the soldering iron.
Connecting to other SPECTRUM-compatible machines escort
the inclusion of a soldering iron and use thereof
according to instructions.
The modem is galvanically isolated from
line (the breakdown voltage of 1.5 Kv). Decoupling is done by
means of optocouplers, and not transformer, as in VICOMMe that
it is yet again cheapens the design and reduces its dimensions.
Met all the standards for terminal
device telephone network (maximum
drain 250 mA, maximum voltage -
220 V, maximum current - 100 mA).
When the computer is off when the modem
do not enjoy, as well as by pressing RESET,
modem off line and does not
it no effect.
The signal of the modem has a frequency
bandwidth to transfer more than 20 kHz, at the reception - more
than 10 kHz, which is more than enough to share for 3200 baud
(if the line and station will allow). Maximum tested
speed - 3900 baud, the results are encouraging.
An important detail: the implemented hardware support
exchange with a modem in the face gating process chosen by
kvartsovannoy frequency signal WAIT. The idea of this - the
program was written under the clock speed of CPU SPECCY not
lower than, say, 3.2 MHz, and all machines with greater
frequency retarding to the desired. Unfortunately,
there is a limit - no more than 7.0 MHz (typical turbo mode).
It is very convenient - the quality of communication does not
depend on makeshift machines and do not use the turbo button,
everything is working, including CONNECT SCORPION-PENTAGON.
Possible to transmit an analogue signal in line with the
quantization of the 16 levels by PWM modulation with sampling
rates up to 23 kHz (voice capabilities AON RUSS-16 and above,
as well as DIGITAL STUDIO).
Structurally the hardware components is a printed circuit
board size 75 * 70 mm and contains a connector in the form of
slots SCORPION / KAY and telephone line jack. Current
consumption from the power source SPECCY about 100 mA.
+12 V is not required.
----- SOFT ----
While the modem into production, we adapt
existing terminal program, as well
also write new ones. Already altered MODEM 3.6 and
written by Caller ID program.
Peredelany MODEM 3.6 can be used for communication XTR-VICOMM.
This project is supported and OMEGA GROUP
program Macro-Modem will be adapted
under the XTR.
We are confident that XTR completely supplant
All VICOMMy and will become the standard platform ZX-SPECTRUM.
----- ---- WISHES
We know that today, except for Peter and
Moscow, modems do not have nowhere in sight. A
therefore offer - try this product
and in your region, you will not regret it.
----- ---- PROGRAMMING
For the curious, users report
minimum required information. Communicating with
The modem is the only port
address # B7 (183).
IN A, (# B7), if the line is not busy modem
Bit7 Bit0
0 0 line is not connected to the modem
0 1 Parallel off the hook. apparatus
1 0 call (possible bugs)
January 1st line is free
IN A, (# B7), if the line is busy modem
Bit7 always 0
Bit0 through it are taken by data
OUT (# B7), A
Bit0 when the line is busy - passed
data when receiving gb = 1
With the release of the line is irrelevant
Bit1 1-take line
0-free line
Bit4 bits determine the time until which
Bit5 hardware stretch interval of time Bit7 Meni between two
consecutive commands Bit6 DAMI IN A, (# B7) or OUT (# B7), A
Bit7-Bit4
# 00 times .000002 * 16 seconds
# 10 times .000002 * 15 seconds
...
# E0 .000002 time * 1 sec
# F0 asynchronous mode, NO WAIT
For the case # F0 did not stretch
all done, as the port # FE in emulation mode VICOMM.
What are bits of 7.4?
example:
LD A, #? 0 *
OUT (# B7), A *
IN A, (# B7)!
POP AF
IN A, (# B7)!
without hardware Support Click Here for instructions marked ",
the period of performance is:
ticks seconds
PENTAGON 11 +10 = 21 .000006
TURBO PENTAGON 11 +10 = 21 * .000004!
SCORPION 12 +10 = 22 .0000063
TURBO SCORPION 12 +10 = 22 * .000004!
KAY 12 +10 = 22 .0000063
TURBO KAY 12 +12 = 24 .0000034
* Plus WAIT
! priblizitelno
For the case of XTR period for all machines
equalized, increasing (!) to the value set in bits, 7.4 (except
for the values # F0).
6
Same for sprvedlivo OUT (# B7), A and
any combination of IN / OUT to port # B7.
Primechanie_1: Naturally, the program should be to write under
the worst car to the execution of commands on this machine was
less than the specified time, to which everything is stretched
(or else it will be compression!).
primechanie_2: period without stretching does not
must be less than .00000229 seconds, (8 bars
neTURBO PENTAGONa, 16 cycles TURBO PENTAGONa), or stretching
will not occur.
Example of a pause in .002 seconds:
W002 XOR A
OUT (# B7), A; period of 32 uS
LD B, 62
W002_1 IN A, (# B7); =. 62 *. 000 032 001 984
DJNZ W002_1
...
On any machine it will be .002 seconds, regardless of the
TURBO / neTURBO.
Programming Examples:
free line OUT (# B7), # F0
take a line OUT (# B7), # F3
Dialing (WAIT ... in seconds):
ADRNUM DB "1234567"
DIAL OUT (# B7), # 00; reset line
WAIT 0.5
OUT (# B7), # 02, take the line
LD HL, ADRNUM
LD C, 7
DIAL7 WAIT 0.5
LD A, (HL)
SUB # 30
JR NZ, DIAL7_0
LD A, 10, for zero-ten
DIAL7_0 LD B, A
INC HL
PUSH HL
PUSH BC
CALL DIALN; set of numbers
POP BC
POP HL
DEC C
JR NZ, DIAL7
WAIT 0.5
OUT (# B7), # 03
RET
DIALN OUT (# B7), # 00
WAIT .06
OUT (# B7), # 02
WAIT .04
DJNZ DIALN1
RET
Data Transfer (principle VICOMM):
OUT (# B7), # F2
WAIT
OUT (# B7), # F3
WAIT
repeat the algorithm
Call Waiting:
WTCALL LD DE, # 8180
XOR A
OUT (# B7), A
WTCL0 LD BC, # FF00
WTCL1 WAIT .002
IN A, (# B7)
AND D
CP E
JR NZ, WTCL2
INC C
WTCL2 DJNZ WTCL1
LD A, C
CP 30; antiglyuk
JR C, WTCL0; no phone call
WTCL3 LD B, 0; forward to the end
WTCL4 WAIT .002; call
IN A, (# B7)
AND D
CP E
JR Z, WTCL3
DJNZ WTCL4
Or you can hold the line
RET
! not recommended to hold the line at the time of the call
(after all 120 volt !!!), have to wait for a pause between
calls (this holds for any terminal device telephone line).
__________________________
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